Police body-cam footage released for the first time shows the shocking moments after a talented grammar school pupil was fatally stabbed by his rich pal.
Tearful former public schoolboy Joshua Molnar, then 17, is seen in the footage lying to police after he had stabbed his friend Yousef Makki, also 17, through the heart.
He is captured telling an officer: "We've come sprinting over and the guy was just coughing up blood."
